Swift 3 Firebase 存储 - 无法上传答案

【问题标题】：Swift 3 Firebase Storage - Unable to uploadSwift 3 Firebase 存储 - 无法上传
【发布时间】：2017-02-03 03:36:46
【问题描述】：

我正在尝试将 UIImage 文件上传到 Firebase 存储。我正在努力弄清楚为什么上传没有完成，即使有调试。

我创建了一个 Firebase 应用并将存储规则设置为可公开访问。

存储引用在属性中定义如下：

var storageRef = FIRStorage.storage().reference().child("images/TestImage.png")

然后在上传方法中（其中meal.photo是一个UIImage）：

let uploadData = UIImagePNGRepresentation(meal.photo!)
let uploadTask = storageRef.put(uploadData!,metadata: nil){ metadata, error in
                if (error != nil) {
                    // Uh-oh, an error occurred!
                } else {
                    // Metadata contains file metadata such as size, content-type, and download URL.
                    let downloadURL = metadata!.downloadURL
                }
            }

我没有收到任何构建/运行时错误，并且我已确认 uploadData 包含我要上传的文件。但是，运行此方法时没有发生任何事情。有什么想法吗？

编辑我已将整个 sn-p 包含在下面以供参考：

@IBAction func unwindToMealList(_ sender: UIStoryboardSegue) {
    if let sourceViewController = sender.source as? MealViewController, let meal = sourceViewController.meal {
        if let selectedIndexPath = tableView.indexPathForSelectedRow {
            // Update an existing meal.
            meals[(selectedIndexPath as NSIndexPath).row] = meal
            tableView.reloadRows(at: [selectedIndexPath], with: .none)
        } else {
            // Add a new meal.
            let newIndexPath = IndexPath(row: meals.count, section: 0)
            meals.append(meal)

            let dateFormatter = DateFormatter()
            dateFormatter.dateFormat = "MM-dd-yyyy"
            let stringDate = dateFormatter.string(from: meal.date!)
            let mealItem = ["name": meal.name, "date": stringDate, "mealType": meal.mealType] as [String : Any]
            tableView.insertRows(at: [newIndexPath], with: .bottom)
            // Add meal to firebase database
            let mealRef = ref.child("meals")
            mealRef.setValue(mealItem)


            // Upload photo
           // let imagesRef = storageRef.child("images")
            let uploadData = UIImagePNGRepresentation(meal.photo!)
            let uploadTask = storageRef.put(uploadData!,metadata: nil){ metadata, error in
                if (error != nil) {
                    // Uh-oh, an error occurred!
                } else {
                    // Metadata contains file metadata such as size, content-type, and download URL.
                    let downloadURL = metadata!.downloadURL
                    print(downloadURL)
                }
            }
        }
        // Save the meals.
        saveMeals()
    }
}

【问题讨论】：

代码看起来正确。你得到一个下载网址吗？如果没有错误或任何其他信息，调试几乎是不可能的。
感谢@MikeMcDonald。不，我没有得到 downloadURL，代码似乎根本没有进入上传方法。我还可以添加哪些其他信息来帮助调试它？抱歉，对此很陌生。
你能在写有// Uh-oh, an error occurred! 的地方添加一行print(error) 还是在那里添加一个断点并确认没有错误？除非从未调用上传（或者您离线的时间足够长），否则我无法相信这些选项都不会触发。
我刚刚又试了一次，都没有触发
文件上传时间过长，抱歉！

标签： ios swift firebase firebase-storage

【解决方案1】：

试试这个，我想你把 saveMeals() 函数放早了，所以上传方法没有被调用...

@IBAction func unwindToMealList(_ sender: UIStoryboardSegue) {
if let sourceViewController = sender.source as? MealViewController, let meal = sourceViewController.meal {
    if let selectedIndexPath = tableView.indexPathForSelectedRow {
        // Update an existing meal.
        meals[(selectedIndexPath as NSIndexPath).row] = meal
        tableView.reloadRows(at: [selectedIndexPath], with: .none)
    } else {
        // Add a new meal.
        let newIndexPath = IndexPath(row: meals.count, section: 0)
        meals.append(meal)

        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "MM-dd-yyyy"
        let stringDate = dateFormatter.string(from: meal.date!)
        let mealItem = ["name": meal.name, "date": stringDate, "mealType": meal.mealType] as [String : Any]
        tableView.insertRows(at: [newIndexPath], with: .bottom)
        // Add meal to firebase database
        let mealRef = ref.child("meals")
        mealRef.setValue(mealItem)


        // Upload photo
       // let imagesRef = storageRef.child("images")
        let uploadData = UIImagePNGRepresentation(meal.photo!)
        let uploadTask = storageRef.put(uploadData!,metadata: nil){ metadata, error in
            if (error != nil) {
                // Uh-oh, an error occurred!
            } else {
                // Metadata contains file metadata such as size, content-type, and download URL.
                let downloadURL = metadata!.downloadURL
                print(downloadURL)
                // New code, put your saveMeals function here.
                self.saveMeals()
            }
        }
    }
    // Old code, please remove this saveMeals function.
    // Save the meals.
    saveMeals()
}

}

【讨论】：